Spanish
For the sauce, heat the 20 ml of olive oil in a small pan over medium heat, cook the chopped onion for 5 minutes, add 2 minced garlic cloves and cook for 1 minute more.
Take the pan off the heat and stir in the paprika and cayenne, then add the crushed tomatoes, vinegar, sugar and a pinch of salt, simmer for 10 minutes and blend until smooth.
For the aioli, mix the mayonnaise with the remaining garlic clove, finely grated, and the lemon juice.
Peel the potatoes, cut them into 2.5 cm cubes, rinse them and dry them well.
Heat the frying oil to 140C and fry the potatoes in batches for 8-10 minutes, until tender but still pale. Drain.
Raise the oil to 180C and fry the potatoes again for 3-4 minutes, until golden and crisp. Drain on paper towels and sprinkle with salt.
Serve hot, topped with the bravas sauce and the aioli.